[Octave-bug-tracker] [bug #62152] Textscan fails in rare occurences

[Markus Mützel]

Update of bug #62152 (project octave):

                  Status:                    None => Confirmed              
        Operating System:       Microsoft Windows => Any                    

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Follow-up Comment #1:

Thanks for your report.

No solution yet. But I believe the issue is that `delimited_stream::peek ()`
doesn't work as expected if peeking beyond what is currently in the buffer
`delimited_stream::m_buf`:
https://hg.savannah.gnu.org/hgweb/octave/file/0826c503f294/libinterp/corefcn/oct-stream.cc#l1267

    int peek (void)
    { return eof () ? std::istream::traits_type::eof () : *m_idx; }


The part of the code where I think this might be an issue is around here:
https://hg.savannah.gnu.org/hgweb/octave/file/0826c503f294/libinterp/corefcn/oct-stream.cc#l2868

    // look for exponent part in, e.g.,  6.023E+23
    bool used_exp = false;
    if (valid && width_left > 1 && m_exp_chars.find (ch) !=
std::string::npos)
      {
        int ch1 = is.peek ();


Maybe we could use `peek_undelim` here? Or somehow fix `delimited_stream::peek
()` when at the end of the buffer?


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